Implements an ISO noise reduction as described in the tutorial below, also this script uses different methods (masking the edges and then blurring the individual color channels or the luminance channel only)

Toggles the visibility of selected layers. Purpose is to see directly the influence that one layer or a group of layers has to the whole image in comparison to the influence of another layer or group of layers.
The visibility-status of the selected layers (by anchor) is switched from visible to invisible and vice versa
each time the script is executed.
So the best way is to use the script with a shortcut-key.
The script installs itself under layer -> stack -> Toggle Visibility

Scale to size is a GIMP script that scales an image given a target for the shorter side, irrespective of the orientation of the picture (portrait or landscape mode). Afterwards the script applies unsharp mask with hardcoded parameters. The parameters have been carefully chosen to achieve a crisp appearance, ideal for internet sized pictures.